aggregator (n.)

c. 1400, "bring together in a sum or mass," from Latin aggregatus, past participle of aggregare "attach, join, include; collect, bring together," literally "bring together in a flock," from assimilated form of ad "to" (see ad-) + gregare "to collect into a flock, gather," from grex (genitive gregis) "a flock" (from PIE root *ger- "to gather"). The intransitive meaning "come together in a sum or mass" is from 1855. Related: Aggregated; aggregating.